A New Damping Model for Nonlinear Stiffness Systems With Variable Preload Displacements and Constant Amplitude Decay Ratios

[+] Author and Article Information
T. Xu, G. G. Lowen

Department of Mechanical Engineering, The School of Engineering of The City College and The Graduate School of the City University of New York, New York, NY 10031

J. Mech. Des 116(1), 257-263 (Mar 01, 1994) (7 pages) doi:10.1115/1.2919356 History: Received July 01, 1991; Online June 02, 2008


This study of the behavior of nonlinear stiffness systems with variable preload displacements and constant amplitude decay ratios showed that the energy loss per cycle is dependent on these preload displacements. By introducing a nonlinear damping force, which is a function of both displacement and velocity, the associated work per cycle can be made approximately the same function of the preload displacement as is the case for the energy loss. In this manner, it becomes possible to make the resulting damping coefficient essentially independent of the preload displacement. This new damping model was incorporated into the mathematical description of an over-running sprag clutch. Confirming experimentation showed very good agreement with computed results.

Copyright © 1994 by The American Society of Mechanical Engineers
Topics: Damping , Stiffness
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